1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
4 *
5 * Derived from linux/arch/mips/bcm63xx/gpio.c:
6 * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
7 * Copyright (C) 2008-2011 Florian Fainelli <florian@openwrt.org>
8 */
9
10 #include <common.h>
11 #include <dm.h>
12 #include <errno.h>
13 #include <asm/gpio.h>
14 #include <asm/io.h>
15 #include <linux/bitops.h>
16
17 struct bcm6345_gpio_priv {
18 void __iomem *reg_dirout;
19 void __iomem *reg_data;
20 };
21
bcm6345_gpio_get_value(struct udevice * dev,unsigned offset)22 static int bcm6345_gpio_get_value(struct udevice *dev, unsigned offset)
23 {
24 struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
25
26 return !!(readl(priv->reg_data) & BIT(offset));
27 }
28
bcm6345_gpio_set_value(struct udevice * dev,unsigned offset,int value)29 static int bcm6345_gpio_set_value(struct udevice *dev, unsigned offset,
30 int value)
31 {
32 struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
33
34 if (value)
35 setbits_32(priv->reg_data, BIT(offset));
36 else
37 clrbits_32(priv->reg_data, BIT(offset));
38
39 return 0;
40 }
41
bcm6345_gpio_set_direction(void __iomem * dirout,unsigned offset,bool input)42 static int bcm6345_gpio_set_direction(void __iomem *dirout, unsigned offset,
43 bool input)
44 {
45 if (input)
46 clrbits_32(dirout, BIT(offset));
47 else
48 setbits_32(dirout, BIT(offset));
49
50 return 0;
51 }
52
bcm6345_gpio_direction_input(struct udevice * dev,unsigned offset)53 static int bcm6345_gpio_direction_input(struct udevice *dev, unsigned offset)
54 {
55 struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
56
57 return bcm6345_gpio_set_direction(priv->reg_dirout, offset, 1);
58 }
59
bcm6345_gpio_direction_output(struct udevice * dev,unsigned offset,int value)60 static int bcm6345_gpio_direction_output(struct udevice *dev, unsigned offset,
61 int value)
62 {
63 struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
64
65 bcm6345_gpio_set_value(dev, offset, value);
66
67 return bcm6345_gpio_set_direction(priv->reg_dirout, offset, 0);
68 }
69
bcm6345_gpio_get_function(struct udevice * dev,unsigned offset)70 static int bcm6345_gpio_get_function(struct udevice *dev, unsigned offset)
71 {
72 struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
73
74 if (readl(priv->reg_dirout) & BIT(offset))
75 return GPIOF_OUTPUT;
76 else
77 return GPIOF_INPUT;
78 }
79
80 static const struct dm_gpio_ops bcm6345_gpio_ops = {
81 .direction_input = bcm6345_gpio_direction_input,
82 .direction_output = bcm6345_gpio_direction_output,
83 .get_value = bcm6345_gpio_get_value,
84 .set_value = bcm6345_gpio_set_value,
85 .get_function = bcm6345_gpio_get_function,
86 };
87
bcm6345_gpio_probe(struct udevice * dev)88 static int bcm6345_gpio_probe(struct udevice *dev)
89 {
90 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
91 struct bcm6345_gpio_priv *priv = dev_get_priv(dev);
92
93 priv->reg_dirout = dev_remap_addr_index(dev, 0);
94 if (!priv->reg_dirout)
95 return -EINVAL;
96
97 priv->reg_data = dev_remap_addr_index(dev, 1);
98 if (!priv->reg_data)
99 return -EINVAL;
100
101 uc_priv->gpio_count = dev_read_u32_default(dev, "ngpios", 32);
102 uc_priv->bank_name = dev->name;
103
104 return 0;
105 }
106
107 static const struct udevice_id bcm6345_gpio_ids[] = {
108 { .compatible = "brcm,bcm6345-gpio" },
109 { /* sentinel */ }
110 };
111
112 U_BOOT_DRIVER(bcm6345_gpio) = {
113 .name = "bcm6345-gpio",
114 .id = UCLASS_GPIO,
115 .of_match = bcm6345_gpio_ids,
116 .ops = &bcm6345_gpio_ops,
117 .priv_auto = sizeof(struct bcm6345_gpio_priv),
118 .probe = bcm6345_gpio_probe,
119 };
120